CN104483213A - Test method of strain sensing performance of intelligent carbon fiber plate - Google Patents
Test method of strain sensing performance of intelligent carbon fiber plate Download PDFInfo
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- CN104483213A CN104483213A CN201410763051.XA CN201410763051A CN104483213A CN 104483213 A CN104483213 A CN 104483213A CN 201410763051 A CN201410763051 A CN 201410763051A CN 104483213 A CN104483213 A CN 104483213A
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Abstract
The invention discloses a test method of strain sensing performance of an intelligent carbon fiber plate. The test method comprises the following steps: (1) longitudinally and uniformly pasting three strain gauges on the surface of a test piece, performing pretension on the test piece, preloading to 5kN, and then unloading to 0kN; (2) repeatedly loading the test piece by taking 0kN as a loading starting point in a loading process, ensuring that the loading force of each level is 10kN, recording reading numbers of the strain gauges and central wavelengths of optical fibers and gratings in the loading process, and recording a tension value of each level of tension and recording a displacement quantity of a clamping head; and (3) after repeated loading is completed, loading step by step until the test piece is finally damaged, and recording the reading numbers of the strain gauges and the central wavelengths of the optical fibers and gratings in a damaging process. According to the test method disclosed by the invention, the strain gauges are adhered to the test piece, the test piece is subjected to repeated graded loading and then is subjected to destructive loading, and the central wavelengths and strain values of the optical fibers and gratings are detected so as to ensure that the testing and evaluation on material performance of the intelligent carbon fiber plate can be facilitated, the accuracy degree of tests can be improved, and further optimization and application of the intelligent carbon fiber plate can be facilitated.
Description
Technical field
The present invention relates to the method for testing of building board, be specifically related to a kind of method of testing of intelligent carbon fiber board strain sensing performance.
Background technology
In recent years, along with the quickening of Urbanization in China, the version of urban architecture changes to the direction of high level, Super High and large span gradually.As can be seen here, the steel construction adapting to this form naturally occupies very important status in national economy.Existing people is improving CFRP plate, combine CFRP plate with fiber grating the CFRP sheet material developed and have intellectual monitoring performance, be called for short: intelligent carbon fiber board, but, method of testing for the strain sensing performance of intelligent carbon fiber board is not perfect, there is no concrete test method, make those skilled in the art be difficult to pass judgment on the concrete strain sensing performance of intelligent carbon fiber board, affect its further Optimal improvements and use.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method of testing of intelligent carbon fiber board strain sensing performance, this test method is simple to operate, economic and practical, can test the strain sensing performance of intelligent carbon fiber board simultaneously.
Object of the present invention carrys out specific implementation by the following technical programs:
A method of testing for intelligent carbon fiber board strain sensing performance, comprises the following steps:
1) longitudinally evenly paste three foil gauges in surface of test piece, pre-stretch-draw is carried out to test specimen, is preloaded into 5kN, be offloaded to 0kN subsequently;
2) repeat to load to test specimen, loading procedure is load starting point with 0kN, every grade of loading force is 10kN, reloading is divided into four steps, be respectively be loaded on 10kN be offloaded to 0kN, hierarchical loading to 20kN be offloaded to 0kN, hierarchical loading to 30kN be offloaded to 0kN, hierarchical loading is offloaded to 0kN to 40kN, record foil gauge reading and fiber bragg grating center wavelength in loading procedure, record the pulling force numerical value of every grade of stretch-draw and the displacement of chuck;
3) repeat after loading completes, carry out destructiveness to test specimen to load, front once repeat to load terminate and be offloaded to 0kN for destructive loading starting point, still getting every grade of 10kN loads, multistage loadings finally destroys to test specimen, foil gauge reading when record destroys and fiber bragg grating center wavelength.
Further, by GM8037 fiber optic high-resolution grating sensor (FBG) demodulator whole process record internal optical fiber raster center wavelength and temperature compensation optical fiber grating centre wavelength, the Indoor Temperature angle value of front and back and each test specimen of serviceability temperature meter record stretches.
The method of testing of a kind of intelligent carbon fiber board strain sensing performance of the present invention, the method is by posting foil gauge on test specimen, carry out destructiveness after carrying out repetition hierarchical loading to test specimen to load, the centre wavelength of fiber grating and strain value are detected, so that testing evaluation intelligence carbon fiber board material energy, the strain sensing repeatability of the intelligent carbon fiber board of abundant checking and larger strain monitoring scope, to reduce uncertain factor, improve the accuracy of test, be convenient to the further optimization to intelligent carbon fiber board and application.
Embodiment
CFRP plate (Carbon Fiber Reinforced Polymer, be called for short: CFRP), Fiber Bragg Grating FBG (Optical Fiber Bragg Grating, be called for short: OFBG), intelligent carbon fiber board (be called for short: CFRP-OFBG plate) to be combined with fiber grating the CFRP sheet material with intellectual monitoring performance developed by CFRP plate.
For above-mentioned intelligent carbon fiber board, method of testing of the present invention is as follows:
The method of testing of a kind of intelligent carbon fiber board strain sensing performance described in the embodiment of the present invention, comprises the following steps:
1) longitudinally evenly paste three foil gauges in surface of test piece, foil gauge adopts DH3860 strain acquirement case and uses half-bridge method to connect and gathers, and carries out pre-stretch-draw, is preloaded into 5kN, be offloaded to 0kN subsequently to test specimen; Wide material testing machine is used to stretch;
2) repeat to load to test specimen, loading procedure is load starting point with 0kN, every grade of loading force is 10kN, reloading is divided into four steps, be respectively be loaded on 10kN be offloaded to 0kN, hierarchical loading to 20kN be offloaded to 0kN, hierarchical loading to 30kN be offloaded to 0kN, hierarchical loading is offloaded to 0kN to 40kN, records foil gauge reading and fiber bragg grating center wavelength in loading procedure; Checking CFRP-OFBG plate has good strain sensing repeatability and larger strain monitoring scope, the pulling force numerical value of computer record every grade stretch-draw using wide material testing machine supporting and the displacement of chuck;
3) repeat after loading completes, carry out destructiveness to test specimen to load, front once repeat to load terminate and be offloaded to 0kN for destructive loading starting point, still getting every grade of 10kN loads, multistage loadings finally destroys to test specimen, foil gauge reading when record destroys and fiber bragg grating center wavelength.
Preferably, the GM8037 fiber optic high-resolution grating sensor (FBG) demodulator whole process record internal optical fiber raster center wavelength produced by adopting Guilin You Xi Ltd and temperature compensation optical fiber grating centre wavelength, and the Indoor Temperature angle value before and after each test specimen stretching of serviceability temperature meter record.
By said method, altogether adopt two pieces of CFRP-OFBG intelligence carbon fiber boards to carry out test analysis, be numbered ZB2-1, ZB2-2 and test respectively, repeat after loading completes, to carry out destructiveness loading to test specimen.Once repeated in the past to load and terminate and be offloaded to 0kN to load starting point for destructive, still getting every grade of 10kN loads, and multistage loadings finally destroys to test specimen.ZB2-1 and ZB2-2 is when being respectively loaded on 75kN and 60kN, and epoxy resin portion phenomenon of rupture appears in test specimen end, is the slippage of amplifying head end tension area sudden change place epoxy resin portion.Continue to load, ZB2-1 test specimen carbon filament collapses gradually and to cause CFRP-OFBG plate to rupture, and stretch-draw displacement increases sharply, and causes fiber grating to be broken rapidly, and reading disappears; ZB2-2 test specimen is smeared uneven due to amplifying head epoxy resin, causes test specimen to form eccentric tension and destroys, and the fracture of left part CFRP-OFBG plate is collapsed silk and destroyed, and right side is intact.
In the strain sensing performance test process of ZB2-1 and ZB2-2, process of the test is shorter, and the changing value of temperature is very little.Temperature reading maintains near 14 DEG C, and the fiber bragg grating center wavelength of temperature compensation is stabilized near 1550.9551 and 1550.9543, therefore, when reading fiber bragg grating center wavelength calculates strain, can ignore the impact of temperature on centre wavelength.
The method of testing of a kind of intelligent carbon fiber board strain sensing performance of the present invention, the method is by posting foil gauge on test specimen, carry out destructiveness after carrying out repetition hierarchical loading to test specimen to load, the centre wavelength of fiber grating and strain value are detected, so that testing evaluation intelligence carbon fiber board material energy, to reduce uncertain factor, improve the accuracy of test, be convenient to the further optimization to intelligent carbon fiber board and application.
Last it is noted that the foregoing is only the preferred embodiments of the present invention; be not limited to the present invention; for a person skilled in the art; it still can regulate the technical scheme described in foregoing embodiments; or equivalent replacement is carried out to wherein portion of techniques feature; within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a method of testing for intelligent carbon fiber board strain sensing performance, is characterized in that comprising the following steps:
1) longitudinally evenly paste three foil gauges in surface of test piece, pre-stretch-draw is carried out to test specimen, is preloaded into 5kN, be offloaded to 0kN subsequently;
2) repeat to load to test specimen, loading procedure is load starting point with 0kN, every grade of loading force is 10kN, reloading is divided into four steps, be respectively hierarchical loading to 10kN be offloaded to 0kN, hierarchical loading to 20kN be offloaded to 0kN, hierarchical loading to 30kN be offloaded to 0kN, hierarchical loading is offloaded to 0kN to 40kN, record foil gauge reading and fiber bragg grating center wavelength in loading procedure, record the pulling force numerical value of every grade of stretch-draw and the displacement of chuck;
3) repeat after loading completes, carry out destructiveness to test specimen to load, front once repeat to load terminate and be offloaded to 0kN for destructive loading starting point, still getting every grade of 10kN loads, multistage loadings finally destroys to test specimen, foil gauge reading when record destroys and fiber bragg grating center wavelength.
2. the method for testing of a kind of intelligent carbon fiber board strain sensing performance according to claim, it is characterized in that: by GM8037 fiber optic high-resolution grating sensor (FBG) demodulator whole process record internal optical fiber raster center wavelength and temperature compensation optical fiber grating centre wavelength, the Indoor Temperature angle value of front and back and each test specimen of serviceability temperature meter record stretches.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105092397A (en) * | 2015-05-25 | 2015-11-25 | 河南科技大学 | Mechanical structure fatigue damage online monitoring test device |
| CN109060538A (en) * | 2018-09-11 | 2018-12-21 | 湘潭大学 | Armored concrete this structure of bond-slip test method and device based on Fibre Optical Sensor |
| CN112607053A (en) * | 2020-12-29 | 2021-04-06 | 中国航空工业集团公司西安飞机设计研究所 | Method for determining accuracy of strain measurement value in airplane structural strength test |
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| US20020020224A1 (en) * | 2000-08-18 | 2002-02-21 | Sho-Bond Corporation | Sheet-like strain sensor for confirming progress of damage of concrete structure and method for confirming progress of damage of concrete structure |
| CN201497490U (en) * | 2009-08-31 | 2010-06-02 | 昆明理工大学 | Optical fiber Bragg grating strain sensor packaged by carbon fiber reinforced composite material |
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| US20020020224A1 (en) * | 2000-08-18 | 2002-02-21 | Sho-Bond Corporation | Sheet-like strain sensor for confirming progress of damage of concrete structure and method for confirming progress of damage of concrete structure |
| CN201497490U (en) * | 2009-08-31 | 2010-06-02 | 昆明理工大学 | Optical fiber Bragg grating strain sensor packaged by carbon fiber reinforced composite material |
Non-Patent Citations (2)
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| 卢少微 等: "埋入光纤布拉格光栅传感器的智能碳纤维复合塑料", 《吉林大学学报（工学版）》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092397A (en) * | 2015-05-25 | 2015-11-25 | 河南科技大学 | Mechanical structure fatigue damage online monitoring test device |
| CN109060538A (en) * | 2018-09-11 | 2018-12-21 | 湘潭大学 | Armored concrete this structure of bond-slip test method and device based on Fibre Optical Sensor |
| CN112607053A (en) * | 2020-12-29 | 2021-04-06 | 中国航空工业集团公司西安飞机设计研究所 | Method for determining accuracy of strain measurement value in airplane structural strength test |
| CN112607053B (en) * | 2020-12-29 | 2022-10-11 | 中国航空工业集团公司西安飞机设计研究所 | Method for determining accuracy of strain measurement value in airplane structural strength test |
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